In TemporalGovernor the guardian has a special permission that they can fastTrackProposalExecution which will bypass the normal queueProposal flow:
https://github.com/code-423n4/2023-07-moonwell/blob/main/src/core/Governance/TemporalGovernor.sol#L261-L268
This as the comment suggest should only be done in emergencies.
However there is nothing indicating that the VAA in question is supposed to be fast tracked. Hence a guardian can always fast track any VAAs that they please, bypassing the queueProposal functionality.
Consider adding another parameter to the payload indicating if the VAA is intended to be fast tracked or not.
